I am parting ways with my Challenge street X Pipe that has been professionally welded to the original BMW Primary Cats (Catalytic Converters) from my M3. This is x pipe is the street version that Challenge no longer offers and is a great solution to improve the sound on the M3 while not affecting smog rules (at least in CA).
Here are the specs from the manufacturer:
- Made in the USA
- Full stainless steel construction
- Laser cut and formed mounting brackets
- 2.5 in Piping
- Twin resonators for noise and drone reduction
- Retains factory primary cats
- No check engine light
- Flanged design for easy installation and upgrade options
- 10 wheel hp and 15 ft tq gains with factory exhaust
- Increased low end power
I can ship at the buyer's expense. These are packed and ready to go.
